| Abstract: | The reaction of 7-chlorotetrazolo1,5-α]quinoxaline 5-oxide 6a with acetic anhydride gave 7-chloro-5-(7-chlorotetrazolo1,5-α]quinoxalin-4-yl)-4,5-dihydro-4-oxotetrazolo1,5-α]quinoxaline 7a , while the reaction of 7-chloro-1,2,4-triazolo4,3-α]quinoxaline 5-oxide 6b with acetic anhydride afforded 7-chloro-5-(7-chloro-1,2,4-triazolo4,3-α]quinoxalin-4-yl)-4,5-dihydro-4-oxo-1,2,4-triazolo4,3-α]quinoxaline 7b and 7-chloro-4,5-dihydro-4-oxo-1,2,4-triazolo4,3-α]quinoxaline 8b . The reaction of compound 6a or 6b with acetic anhydride/acetic acid provided 7-chloro-4,5-dihydro-4-oxo-tetrazolo1,5-α]quinoxaline 8a or compound 8b , respectively. |
